Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

Method for evaluating corrosion defect of pipeline

A defect evaluation and pipeline technology, which is applied in special data processing applications, instruments, electrical digital data processing, etc., can solve the problem that the evaluation formula cannot accurately analyze pipeline corrosion defects, and achieve perfect material models and calculation models, wide application range, The effect of accurate simulation results

Pending Publication Date: 2022-01-14
CHINA PETROLEUM & CHEM CORP +1
View PDF0 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the purposes of the present invention is to provide a pipeline corrosion defect evaluation method and device, thereby improving the problem that the evaluation formula in the prior art cannot accurately analyze pipeline corrosion defects

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for evaluating corrosion defect of pipeline
  • Method for evaluating corrosion defect of pipeline
  • Method for evaluating corrosion defect of pipeline

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] In this embodiment, the pipeline corrosion defect evaluation method of the present invention is used to analyze the actual oil and gas pipeline of a certain project. Various parameters of the pipeline (pipe material, outer diameter, wall thickness, maximum allowable working pressure MAOP, elastic modulus E, Poisson's ratio, yield stress σ s , tensile strength and safety factor F s ) as shown in the table below.

[0037]

[0038] Allowable stress [σ] = σ s / F s =320 / 2=160MPa.

[0039] In this embodiment, the length of the pipeline corrosion defect is 30 mm, the depth is 30% of the wall thickness, and the width is 5.7 mm. Many literatures show that the pressure of the axial defect has a great influence, but the circumferential width has little effect. In this embodiment, the axial defect is used for simulation.

[0040] According to the characteristics of oil and gas pipelines, the finite element model of the pipeline is established as follows: the material of the...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a method for evaluating a corrosion defect of a pipeline. The method at least comprises the following steps: acquiring parameters of the pipeline and parameters of the defect; obtaining allowable stress [sigma] of the pipeline; establishing a finite element model according to the obtained parameters of the pipeline and parameters of the defect; performing simulation through the established finite element model to obtain the maximum stress sigma max of a position with the corrosion defect; establishing a pipeline corrosion defect evaluation equation A = [sigma] / sigma max to obtain the safety state of the pipeline, wherein when A = [sigma] / sigma max > 1, it is considered that the pipeline is in the safety state, and when A = [sigma] / sigma max < = 1, it is considered that the pipeline is in a failure state. The invention further discloses a device for evaluating the corrosion defect of the pipeline. According to the method and device for evaluating the corrosion defect of the pipeline, the conservative property of an existing formula is avoided, and the evaluation result is more accurate; and the application range is wider.

Description

technical field [0001] The invention relates to the technical field of petrochemical industry, in particular to a method and device for evaluating pipeline corrosion defects. Background technique [0002] With the rapid development of the economy, the demand for energy transportation increases. Among the many transportation methods, pipeline transportation has developed rapidly around the world due to its advantages such as low cost, large transportation volume, high safety and stable supply, especially in petrochemical and natural gas transportation industries. As the service life increases, the corrosion of pipelines becomes more and more serious, the pressure bearing capacity of pipelines decreases, and accidents such as perforation, leakage, and rupture occur from time to time. Predicting and evaluating the corrosion defects of pipelines can prevent problems before they happen, and can reduce the safety risk of pipeline operation. [0003] The residual strength evaluat...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G06F30/23G06F113/14G06F119/04G06F119/14
CPCG06F30/23G06F2113/14G06F2119/04G06F2119/14
Inventor 赵亚通石磊奚旺崔凯燕周立国黄梓健
Owner CHINA PETROLEUM & CHEM CORP
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com